The ornamental design for a wastebasketadapterring, as shown and described.
FIG. 1 is a top perspective view of a wastebasket adapter ring showing my
new design, the broken lines are for illustrative purposes only and form
no part of the claimed design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof, the rear elevational view being
a mirror image of that shown;
FIG. 4 is a side elevational view thereof, the opposite side elevational
view being a mirror image of that shown;